This International Standard specifies three methods for deter-mining the resistance of the outer covers of hoses to ozone:
method 1 - for bore sizes up to and including 25 mm carried out on the hose itself;
method 2 - for bore sizes greater than 25 mm carried out on a test piece from the hose wall;
method 3 - for bore sizes greater than 25 mm carried out on a test piece from the cover.
Methods 1 or 2 should normally be used. Method 3 should be used only if it is not possible to carry out the test in accordance with method 2.
NOTE — For hoses with built-in fittings from which it is not possible to take test pieces, the ozone resistance may be assessed on slabs in accordance with ISO 1431/1, using test sheets of the appropriate polymeric compound vulcanized to the same degree.